Question

identifying included angles
use δdef to complete the statements.
angle e is the included angle between sides
the included angle between sides fe and df is angle

Explanation:

Step1: Recall included angle definition

An included angle is between two sides of a triangle, formed by their intersection at a vertex. For angle \( E \) in \( \triangle DEF \), the sides meeting at \( E \) are \( FE \) and \( DE \) (or \( ED \)).

Step2: Analyze sides \( FE \) and \( DF \)

Sides \( FE \) and \( DF \) meet at vertex \( F \), so the included angle is \( \angle F \) (or angle \( F \)).

Answer:

1. Angle \( E \) is the included angle between sides \( FE \) and \( DE \) (or \( ED \)).
2. The included angle between sides \( FE \) and \( DF \) is angle \( F \).